You appear to be wanting to access one account simultaneously. That's a different can of worms. With your IMAP account, you are accessing either with phone or PC or laptop, but not simultaneously. As long as you two do not use the account at same time, there should be no problem. TB, itself, doesn't do what you want, but maybe someone else here can suggest an approach. And maybe concurrent access wasn't in your plans.

Thanks for the reply.

I never really thought about concurrent usage or not. But, I suppose there is a possibility of overlap. I suppose the issue would arise if we both tried to manipulate the same message at the same time.

I thoughts we also with the add-ons and the tags that attach information on to each message when used. This might cause the same issue, if reading and writing to the profile config files that would contain this information.

The idea came up after seeing google do something similar. I know TBird is not Gmail, but many of th efeatures overlap, and this would be very useful.

THanks

Any body might have any other ideas? Suggestions? Can TBird be used in this manner, or is it best to find another solution?

Storing profiles in Dropbox accounts is not recommended. If you could avoid simultaneous access to IMAP folders, information could be added to messages by editing the Subject or message source with an add-on:

https://addons.thunderbird.net/en-us/thunderbird/addon/header-tools-improved/

Tags only work if the IMAP server supports key words.