Being without email for a few days is tough. Surprisingly so considering it is a relatively recent addition to our means of communication. If email uptime is of critical importance to someone, they should either have an alternate email service to use and from which they can inform their most important contacts that their primary email is not working and/or they should purchase a paid email service that has strong guarantees and a strong track record on uptime. iCloud is a free service (not counting the extra storage that can be purchased) and Apple makes no guarantees on uptime. The iCloud Terms and Conditions that we all agreed to can be read in their entirety at http://www.apple.com/legal/icloud/en/terms.html . Below is an exerpt. The bold is from the actual document, I did not make it bold. I suppose they felt it was important so they made it stand out:
APPLE DOES NOT GUARANTEE, REPRESENT, OR WARRANT THAT YOUR USE OF THE SERVICE WILL BE UNINTERRUPTED OR ERROR-FREE, AND YOU AGREE THAT FROM TIME TO TIME APPLE MAY REMOVE THE SERVICE FOR INDEFINITE PERIODS OF TIME, OR CANCEL THE SERVICE IN ACCORDANCE WITH THE TERMS OF THIS AGREEMENT.
YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS. APPLE AND ITS AFFILIATES, SUBSIDIARIES, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, PARTNERS AND LICENSORS EXPRESSLY DISCLAIM ALL WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. IN PARTICULAR, APPLE AND ITS AFFILIATES, SUBSIDIARIES, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, PARTNERS AND LICENSORS MAKE NO WARRANTY THAT (I) THE SERVICE WILL MEET YOUR REQUIREMENTS; (II) YOUR USE OF THE SERVICE WILL BE TIMELY, UNINTERRUPTED, SECURE OR ERROR-FREE; (III) ANY INFORMATION OBTAINED BY YOU AS A RESULT OF THE SERVICE WILL BE ACCURATE OR RELIABLE; AND (IV) ANY DEFECTS OR ERRORS IN THE SOFTWARE PROVIDED TO YOU AS PART OF THE SERVICE WILL BE CORRECTED.
APPLE DOES NOT REPRESENT OR GUARANTEE THAT THE SERVICE WILL BE FREE FROM LOSS, CORRUPTION, ATTACK, VIRUSES, INTERFERENCE, HACKING, OR OTHER SECURITY INTRUSION, AND APPLE DISCLAIMS ANY LIABILITY RELATING THERETO.