They're actually letting you know what data center you're accessing as well. BLU / BL1/2 are "Blue Ridge", in Virginia (a few different towns). SN = San Antonio, TUK/TK = Tukwila WA, AMS = Amsterdam, DB2/3 = Dublin, etc. Sometimes there are multiple DCs in the same city, sometimes the number just means a different cage in the same DC, and between products you'll see different naming conventions even for the data centers.
It's fun what you can find out given those hostnames. It shows how a unified offering like Office 365 is actually just a few totally separate products, usually hosted in different data centers, that all happen to plug into the same user provisioning system.
I am. I know it's not such a big deal but I would have liked to just have a list of my users and their configuration, I imagine it wouldn't be that hard to get and we would have been much happier doing the migration.
It's fun what you can find out given those hostnames. It shows how a unified offering like Office 365 is actually just a few totally separate products, usually hosted in different data centers, that all happen to plug into the same user provisioning system.