We've always told you though that if your user community mainly consisted of "islands" who tend to only meet internally you could get away with migrating a department (or island) at a time.
But nobody took us up on it.
UNTIL a university in upstate New York said "OK -- we'll try that."
Russ and Zyg sucked in their breath and said "All right then. But if things are not going well after the first few we're going to re-evaluate this, right?"
THREE separate group migrations into it, they seem to be going all right.
There's a few more to go and we're still looking at it, but the results so far are good and we want to give you a preliminary read on how they did it and what's making it work. We're also giving them the opportunity to add anything they want to share in this post.
- It's relatively small (about 500 users).
- They are able to identify very specific groups that meet together. The MM / Exchange administration team are doing this on their own without intense database analysis from us (which has helped keep their costs down).
- Once the island is migrated those users are removed from the Meeting Maker user list. Since they're islands, this isn't usually a problem. As Russ put it, "They burned their bridges after they crossed over."
- The migration team at the university gained experience early on in mapping users and after a proof of concept migrating their internal team they then proceeded to two other islands. Again, their motivation and competence here was key in keeping costs in control.
- After three separate island migrations things are looking good to complete the rest on a staggered schedule.
- The university adds that advance testing and end-user expectation communication made things go better.
- We at Sumatra are happy to give credit whenever our clients are more clever than we are.
So our moral: It is possible, but start small and keep an eye on it as you move forward.
What's this look like from an end-user's perspective? The same as it would in a full migration. They walk in one morning and user Meeting Maker. They walk in the next morning and they're on Exchange. BUT: Any MM users not in the migrated group are now not on their guest lists. That's the price you pay for this staggered approach. In the immortal acronym of Robert Heinlein as morphed by Milton Friedman, TANSTAAFL.