The Jabber "Reset" option keeps the user's contacts but does wipe all chat history from those contacts.
A user may have the chats store in a folder under Outlook but many do not after our conversion to O365.
However, you have another source for these chat history: Jabber.
Jabber chats are stored in a small database located in the "History" folder inside each user's AppData Windows profile:
Username\Appdata\Local\Cisco\Unified Communications\Jabber\CSF\History.
To preserve a user's Jabber chats do the following:
- Copy the History folder from the above path to the local disk BEFORE you reset Jabber.
- Reset Jabber for the user.
- Have the user Sign In to Jabber, then Sign Out again.
- Overwrite the new (empty) History folder with the saved version.
- User signs into Jabber again. Their chat history for all contacts will be present.