There is no straight forward option in Cisco Jabber for Windows to clear conversation history but you can use this as a workaround:

1) Exit Cisco Jabber for Windows

2) Delete the file "userid@domain.db" from the following location

For XP:

C:\Documents and Settings\\Local Settings\Application Data\Cisco\Unified Communications\Jabber\CSF\History

For Win 7:

C:\Users\\AppData\Local\Cisco\Unified Communications\Jabber\CSF\History

3) Restart Jabber and now IM's would have been cleared.

https://supportforums.cisco.com/thread/2149160

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MDGDP, CCNA, CCNA Voice certified