MS outlook 2016 and icloud email account

I had the same problem. I found out that Outlook was trying to put sent messages into a folder called 'Sent Items' on icloud which does not exist.

To Fix go to Tools -> Accounts and select your icloud account. From there, select the 'Folders' tab.

In the sent items (top of the form) select 'Sent Messages (Server)'.

You may need to move items from the folder that Outlook had stored the sent messages in. In my case it was on the sidebar under Icloud -> Sent Items. Once you do that, restart Outlook and let everything sync again.

Here's a screen shot:

Eric, here's my report from EtreCheck. Thanks for the recommendation.

Sid

EtreCheck version: 3.1.5 (343)

Report generated 2017-02-26 14:41:36

Download EtreCheck from https://etrecheck.com

Runtime 3:42

Performance: Good

Click the [Support] links for help with non-Apple products.

Click the [Details] links for more information about that line.

Click the [Check files] link for help with unknown files.

Problem: Other problem

Description:

Error 1025 Mailbox does not exist error in Outlook 365 for Mac

Hardware Information: ⓘ

iMac (27-inch, Late 2012)

[Technical Specifications] - [User Guide] - [Warranty & Service]

iMac - model: iMac13,2

1 2.9 GHz Intel Core i5 (i5-3470S) CPU: 4-core

8 GB RAM Upgradeable - [Instructions]

BANK 0/DIMM0

4 GB DDR3 1600 MHz ok

BANK 1/DIMM0

4 GB DDR3 1600 MHz ok

BANK 0/DIMM1

Empty

BANK 1/DIMM1

Empty

Bluetooth: Good - Handoff/Airdrop2 supported

Wireless: Unknown

Video Information: ⓘ

NVIDIA GeForce GTX 660M - VRAM: 512 MB

iMac 2560 x 1440

System Software: ⓘ

macOS Sierra 10.12.3 (16D32) - Time since boot: less than an hour

Disk Information: ⓘ

APPLE HDD ST1000DM003 disk0 : (1 TB) (Rotational)

[Show SMART report]

EFI (disk0s1) <not mounted> : 210 MB

Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB

[redacted] HD (disk1) / [Startup]: 998.97 GB (710.81 GB free)

Core Storage: disk0s2 999.35 GB Online

USB Information: ⓘ

VIA Labs, Inc. USB2.0 Hub

Apple Inc. FaceTime HD Camera (Built-in)

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Apple, Inc. Keyboard Hub

Logitech USB-PS/2 Optical Mouse

Apple Inc. Apple Keyboard

VIA Labs, Inc. USB3.0 Hub

Western Digital My Passport 07B8

Apple Inc. MacBook Air SuperDrive

Thunderbolt Information: ⓘ

Apple Inc. thunderbolt_bus

Gatekeeper: ⓘ

Mac App Store and identified developers

Unknown Files: ⓘ

~/Library/Safari/Extensions/Trend Micro Toolbar.safariextz

One unknown file found. [Check files]

Kernel Extensions: ⓘ

/Applications/VMware Fusion.app

[not loaded] com.vmware.kext.vmci (8.5.3 - 2016-11-30) [Support]

[not loaded] com.vmware.kext.vmioplug.15.2.0 (8.5.3 - 2016-11-30) [Support]

[not loaded] com.vmware.kext.vmnet (8.5.3 - 2016-11-30) [Support]

[not loaded] com.vmware.kext.vmx86 (8.5.3 - 2016-11-30) [Support]

/Applications/Western Digital/WD +TURBO Installer.app

[not loaded] com.wdc.driver.1394.64.10.9 (1.0.1 - SDK 10.9 - 2013-09-07) [Support]

[not loaded] com.wdc.driver.1394HP (1.0.11 - SDK 10.4 - 2013-09-07) [Support]

[not loaded] com.wdc.driver.1394_64HP (1.0.1 - SDK 10.6 - 2013-09-07) [Support]

[not loaded] com.wdc.driver.USB-64HP (1.0.3 - 2013-09-07) [Support]

[not loaded] com.wdc.driver.USB.64.10.9 (1.0.1 - SDK 10.9 - 2013-09-07) [Support]

[not loaded] com.wdc.driver.USBHP (1.0.14 - 2013-09-07) [Support]

/Library/Application Support/VirtualBox

[loaded] org.virtualbox.kext.VBoxDrv (5.0.20 - 2016-04-29) [Support]

[loaded] org.virtualbox.kext.VBoxNetAdp (5.0.20 - 2016-04-29) [Support]

[loaded] org.virtualbox.kext.VBoxNetFlt (5.0.20 - 2016-04-29) [Support]

[loaded] org.virtualbox.kext.VBoxUSB (5.0.20 - 2016-04-29) [Support]

/System/Library/Extensions

[not loaded] com.Belcarra.iokit.USBLAN_netpart (3.1.1 - SDK 10.6 - 2017-02-22) [Support]

[not loaded] com.Belcarra.iokit.USBLAN_usbpart (3.1.1 - SDK 10.6 - 2017-02-22) [Support]

[loaded] com.Logitech.Control Center.HID Driver (3.7.0 - SDK 10.6 - 2017-02-22) [Support]

[not loaded] com.Logitech.Unifying.HID Driver (1.3.0 - SDK 10.6 - 2017-02-22) [Support]

[not loaded] com.RemoteControl.USBLAN.usbpart (3.1.1 - SDK 10.7 - 2017-02-22) [Support]

/System/Library/Extensions/2.2.0/Belcarra.USBLAN_netpart.kext/Contents/Plug-Ins

[not loaded] com.belcarra.iokit.netpart.panther (1.6.3 - 2012-06-19) [Support]

/System/Library/Extensions/2.2.0/Belcarra.USBLAN_usbpart.kext/Contents/Plug-Ins

[not loaded] com.belcarra.iokit.usbpart.panther (1.6.3 - 2012-06-19) [Support]

/System/Library/Extensions/2.2.0/RemoteControl.USBLAN_usbpart.kext/Contents/Plu g-Ins

[not loaded] com.RemoteControl.USBLAN.panther (1.6.2 - 2012-06-19) [Support]

System Launch Agents: ⓘ

[not loaded] 7 Apple tasks

[loaded] 183 Apple tasks

[running] 90 Apple tasks

System Launch Daemons: ⓘ

[failed] com.apple.smbd.plist (2017-01-13)

[not loaded] 37 Apple tasks

[loaded] 171 Apple tasks

[running] 103 Apple tasks

Launch Agents: ⓘ

[running] com.Logitech.Control Center.Daemon.plist (2013-08-01) [Support]

[not loaded] com.adobe.AAM.Updater-1.0.plist (2017-01-02) [Support]

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (2017-01-13) [Support]

[loaded] com.carbonite.launchd.carbonitealerts.plist (2017-02-26) [Support]

[running] com.carbonite.launchd.carbonitestatus.plist (2016-10-17) [Support]

[loaded] com.google.keystone.agent.plist (2017-01-13) [Support]

[not loaded] com.teamviewer.teamviewer.plist (2014-09-28) [Support]

[not loaded] com.teamviewer.teamviewer_desktop.plist (2014-09-18) [Support]

[loaded] com.trendmicro.itis.dca.plist (2016-09-21) [Support]

[running] com.trendmicro.itis.gaagent.plist (2016-09-21) [Support]

[running] com.trendmicro.itis.uimgmt.agent.plist (2016-09-21) [Support]

Launch Daemons: ⓘ

[running] com.Xerox.SuppliesAssistantClient.plist (2016-06-14) [Support]

[loaded] com.adobe.ARMDC.Communicator.plist (2017-01-13) [Support]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (2017-01-13) [Support]

[running] com.adobe.agsservice.plist (2017-01-25) [Support]

[loaded] com.adobe.fpsaud.plist (2017-01-30) [Support]

[running] com.carbonite.launchd.carbonitedaemon.plist (2016-10-17) [Support]

[running] com.fitbit.galileod.plist (2014-10-29) [Support]

[loaded] com.google.keystone.daemon.plist (2017-01-24) [Support]

[running] com.microsoft.autoupdate.helper.plist (2017-02-19) [Support]

[loaded] com.microsoft.office.licensingV2.helper.plist (2017-02-16) [Support]

[running] com.sonos.SonosLibraryServer.plist (2016-12-12) [Support]

[loaded] com.sonos.smbbump.plist (2013-08-05) [Support]

[not loaded] com.teamviewer.teamviewer_service.plist (2014-09-28) [Support]

[running] com.trendmicro.icore.av.plist (2016-09-08) [Support]

[running] com.trendmicro.icore.main.plist (2016-09-08) [Support]

[running] com.trendmicro.icore.wp.plist (2016-09-08) [Support]

[running] com.trendmicro.itis.plugin.plist (2016-09-08) [Support]

[loaded] com.wdc.WDPrivilegedHelper.plist (2015-08-11) [Support] - /Library/PrivilegedHelperTools/com.wdc.WDPrivilegedHelper: Executable not found!

[loaded] com.westerndigital.ErasePrivilegedHelper.plist (2015-08-11) [Support]

[not loaded] org.virtualbox.startup.plist (2016-04-29) [Support]

User Launch Agents: ⓘ

[loaded] com.adobe.AAM.Updater-1.0.plist (2016-11-24) [Support]

[failed] com.adobe.ARM.[...].plist (2013-08-02) [Support] - /Applications/Adobe Reader.app/Contents/MacOS/Updater/Adobe Reader Updater Helper.app/Contents/MacOS/Adobe Reader Updater Helper: Executable not found!

[loaded] com.shirtpocket.backupbytime.plist (2017-02-17)

[running] com.spotify.webhelper.plist (2015-02-02) [Support]

[loaded] com.trendmicro.itis.uninstaller.plist (2016-09-21) [Support]

[not loaded] org.virtualbox.vboxwebsrv.plist (2016-04-29) [Support]

User Login Items: ⓘ

iTunesHelper Application (2017-01-24)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

VMware Fusion Start Menu Application

(/Applications/VMware Fusion.app/Contents/Library/VMware Fusion Start Menu.app)

Dropbox Application

(/Applications/Dropbox.app)

Google Drive Application

(/Applications/Google Drive.app)

WDDriveUtilityHelper Application

(/Applications/Western Digital/WD Drive Utilities.app/Contents/WDDriveUtilityHelper.app)

Internet Plug-ins: ⓘ

FlashPlayer-10.6: 24.0.0.221 - SDK 10.9 (2017-02-15) [Support]

QuickTime Plugin: 7.7.3 (2017-01-13)

AdobePDFViewerNPAPI: 15.023.20056 - SDK 10.11 (2017-01-23) [Support]

AdobePDFViewer: 15.023.20056 - SDK 10.11 (2017-01-23) [Support]

Flash Player: 24.0.0.221 - SDK 10.9 (2017-02-15) [Support]

SharePointBrowserPlugin: 14.5.3 - SDK 10.6 (2015-07-14) [Support]

PepperFlashPlayer: 24.0.0.221 - SDK 10.9 (2017-02-15) [Support]

GarminGpsControl: 4.0.4.0 Release - SDK 10.6 (2012-11-02) [Support]

Silverlight: 5.1.41212.0 - SDK 10.6 (2016-05-27) [Support]

JavaAppletPlugin: 15.0.1 - SDK 10.12 (2014-08-24) Check version

Safari Extensions: ⓘ

Trend Micro Toolbar (2016-09-21)

Trend Micro Toolbar for Mac - Trend Micro (2016-09-08)

3rd Party Preference Panes: ⓘ

Carbonite Pro (2016-10-17) [Support]

Flash Player (2017-01-30) [Support]

Logitech Control Center (2013-08-01) [Support]

Time Machine: ⓘ

Skip System Files: NO

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

SCH_iMac HD: Disk size: 998.97 GB Disk used: 288.17 GB

Destinations:

MacBook Pro Backup [Local]

Total size: 499.73 GB

Total number of backups: 39

Oldest backup: 2/10/17, 08:05

Last backup: 2/26/17, 13:51

Size of backup disk: Too small

Backup size 499.73 GB < (Disk used 288.17 GB X 3)

Top Processes by CPU: ⓘ

47% CarboniteDaemon

11% iCoreService_av

3% WindowServer

2% kernel_task

1% fontd

Top Processes by Memory: ⓘ

911 MB kernel_task

213 MB Google Drive

205 MB Dropbox

164 MB com.apple.WebKit.WebContent

156 MB callservicesd

Virtual Memory Information: ⓘ

3.60 GB Available RAM

1.31 GB Free RAM

4.40 GB Used RAM

2.30 GB Cached files

0 B Swap Used

Diagnostics Information: ⓘ

Feb 26, 2017, 02:32:34 PM Self test - passed

Feb 23, 2017, 05:16:08 PM /Library/Logs/DiagnosticReports/iCoreService_av_2017-02-23-171608_[redacted].cp u_resource.diag [Details]

/Library/Application Support/TrendMicro/*/iCoreService_av

Feb 23, 2017, 03:05:21 PM /Library/Logs/DiagnosticReports/CarboniteDaemon_2017-02-23-150521_[redacted].cp u_resource.diag [Details]

/Library/Application Support/Carbonite/CarboniteDaemon.app/Contents/MacOS/CarboniteDaemon

I have the same issue, and have contacted Microsoft support from the suggestions from Eric Root. Bottom line, they could not tell me why I am getting this annoying error.

In my case, it seems to be machine-specific, on my iMac. It doesn't happen on my MacBook Air. Also, I went for 24 hours yesterday without this happening, but today it is back. The number of errors generated for each send/receive cycle varies as well, from one up to six. (go figure).

Any help is appreciated. Thanks.

Sid

Try running this program in your normal account on the iMac, then copy and paste the output in a reply. The program was created by etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy Report” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Thanks for the recommendation. I have had Trend Micro installed for several years, keeping it updated with the latest versions, definitions, etc. The Outlook 365 issue just started a week ago, for no apparent reason that I can see. The incidents of the error message coming up have now jumped to 13 every time Outlook sends/receives per its schedule. This isn't consistent, either, as it took a 24 hour break over the weekend. Tomorrow, it may go back down to 3, or 5, who knows.

I appreciate your input, and wonder if we might have a keychain password/login issue? If others are having this issue, please chime in.

Thanks again.

Sid

The problem continues and has now appeared on both my iMac and MacBook Air. Same error messages, same random number of incidents when Outlook checks the mail. This is obviously an issue between Outlook 365 for Mac and my iCloud account. This does not occur with the Exchange account in Outlook, or with my iCloud account on my iPhone and iPad, that use Apple Mail and not Outlook. OK, don't ask, I use Outlook by choice, but it doesn't work very well with my iPhone as it isn't up to par with Outlook on the computers. The fact this just started little over a week ago tells me something done "in the Cloud" is causing this, since my settings have not changed. Come on, Apple and Microsoft, get this annoying issue fixed.

I wanted to keep y'all posted on the latest developments with Outlook 365 on the Mac. I can’t explain the weirdness, but it’s interesting. First, I changed the settings back to what Outlook sets up automatically for an iCloud account. It worked fine without the 2015 Mailbox not found error for about a day. Then it started giving me the error, in random incidences. This continued on my iMac and MacBook Air for several days. Then I updated Outlook 365 when prompted by auto update. This did not fix the problem.

I then went to the iCloud web site for mail and tried to edit folders and settings, but this really didn’t work, and Outlook seemed to want to do its own thing when designating folders for managing mail. I also deleted Outlook related keychain items and trashed the Outlook plist from user/library/preferences. I let it do its thing, and decided to see what happens; the errors continued for about two days. Yesterday, the error messages suddenly stopped on their own, without me doing anything in Outlook or in iCloud Mail Web settings.

Today, it is still working without errors. I have no idea why it cleared up on its own. Go figure.

Any thoughts?

Sid

Problem continues this morning. Now up to 11 errors every time Outlook does a send/receive. This is odd, as it seems to vary as to what time of day it is.

Try looking posting here.

Microsoft Office 365 Communities

Microsoft Office 365 Support

I don't see any potential trouble makers installed. The trendmicro software could be a problem. You can try uninstalling it using the developer's uninstall instructions to see if that helps.