Adium + Office Communicator

Solution 1:

A SIPE plugin is under development. Here's a link to an Adium plugin binary: dropbox

And here's the link to the Adium issue tracking system so you can follow progress: trac.adium.com

Looks like a number of people are interested and development is active.

See comment 144 for plugin installation instructions.

Solution 2:

I am using Adium 1.5.8 with SIPE Plugin 1.17.0 on Mac 10.8.5

1. Remove previous version of Adium installed on your mac.
2. Copy SIPE Plugin to ~/Library/Application Support/Adium 2.0/PlugIns
3. Restart Adium and account creation should list "Office Communicator"