There are several Lotus Clients around for Pocket PCs. Cadenza from
www.commontime.com seems to get the best reviews. It is a complete Notes client and can sync with a desktop client or directly with a notes server (given connectivity). I am forced to use Lotus at work but have refused to adulterate my PPC with a client
You'll wind up with two PIMs on your PPC. One Outlook based and one Lotus based. I don't think there is any way to combine them into one, on the desktop or the PPC. Actually that keeps your personal and work stuff seperate which is often a desire that is difficult to meet with Outlook alone.
Have you considered loading a copy of Lotus at home? The client coexists peacefully with Outlook and would allow you to check your mail, calendar, etc. from home. You would just need your id file and a maybe a couple of .nsf files if you want a local contacts list. Your Lotus Admin could tell you if they are set up to provide that, and help you out. (I have done this, to allow keeping in touch when ill, or such. Our liscensing supports this BTW))