hi. thank you.
i forgot to mention that i did check the default email reader for Mail Preferences and it is in fact set to Mail. this is really weird since my system on my mac pro that is running Lion is also set to Mail in Preferences and i just click on the "Share" button and it pulls up an outgoing email in Mac Mail.
on my laptop in Mountain Lion it pulls up these three options all of which say "...Card":
"Message Card" and
with "Email Card" pulling up Thunderbird.
anyone have any ideas before i go through the trouble of uninstalling Thunderbird? seems like this should not be necessary and the "Airdrop" and "Message" pulldowns seem to indicate something has changed here in Mountain Lion...