Active directories might be a bit problematic. You might have to set them up with backwards compatibility to NT on the windows side. But I can't tell you anything specific. Might take one or two posts in the Networking forum.
For connection with outlook stuff you might want to try evolution or kontact. But this is another problematic issue, because the exchange protocol is proprietary, so there might be tons of issues that I can't give you any insight about either. (Just remember: It's microsofts fault. They are probably even facing charges for monopoly abuse on this one also.
For office try open-office. It can read and write doc files if it needs to.
If this is all you want to do, it pains me to say this, but you probably want to try suse.
And in any case keep your windows installation for now, and make a backup of everything important before installing suse.