It would be so easy - but less profitable (?) - for Microsoft to provide a skeleton version of WLM for those not wanting the enormous full application (around 150mb) plus a converting program to facilitate transfers of address bks/messages which don't use WLM formats.
For those like me using more than 1 Windows system on the same PC and wanting to use a common address book and message store WLM has been a nightmare.
I have finally resolved my problems by dropping WLM in favour of Mozilla's Thunderbird which comes in at 40mb! Then use the 'Dawn' FREE address converter [http://mysite.verizon.net/zakharin/software/Dawn/
] to convert & import address books.