You do kinda need ActiveSync installed on the PC to talk to the phone at all. Then if you also install Outlook on the PC, lo and behold, all the contacts will be sync'd to the PC. Then when you get the SDA you can sync them back. Outlook and AS should have come with your 5600. They would come with the SDA if you just go get it.
Just AS can be downloaded for free from MS, but then you still don't have a good way to extract the numbers without Outlook. You could get a trial of Pocket Controller (good remote control program) and just use it long enough to do the SIM transfer thing, but SIMs don't hold all the info Contacts does, so you might lose stuff, like number of stars in notes
P.S. that's Outlook, not Outlook Express
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MS-MVP, Mobile Devices
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