Photoshop :: PC > Mac Migration Portfolio/Cumulus

if anyone could shed any light on issues that might crop up with the following situation:

A few years back, we had a Mac G4 and did all our (largely Photoshop) work on this, backed up on Mac format CDs. Then our new employer forced us to switch to PC (for compatibility with the other designers) and I spent ages going through each of our CDs, resaving them as PC format.

We had an application called Extensis Portfolio 6.0 which we used on the Mac to catalogue all of our images across the hundreds of CDs, but the PC people were using Canto Cumulus, so I dutifully created a new catalogue in Cumulus and spent ages entering the back catalogue.

My question, then, is can the Mac version of Cumulus read the PC created catalogue file, and will there be any incompatibilities (in naming format, etc.) in cataloguing both PC and Macintosh format image CDs?

Also, are there any more general issues that may crop up from a large scale conversion from PC to Mac? I think I can sort out email, but I'm worried that, say, Office XP files won't work in Office:Mac, or the Silverfast 6.0 software we use to scan with our Epson 1680 is inferior in the Mac version somehow.