I hope someone can give me some concrete guidance on this, as I can't find anything out there that actually spells this out for me. We have got6 main sites, 2 of which are Datacentres, and the other 4 are smaller computer sites, with no IT staff. We have 1600 users in 60 locations, all with Exchange mailboxes, and400 "Generic" mailboxes that are for job functions and not individuals. We currently have 3 Exchange 2003 servers and a single front-end server. Mailboxes average at 1Gb. What we want to do is have 2 large Exchange 2007 Mailbox servers in the 2 datacentres (Adelaide and Melbourne)and 4 smaller Exchange Mailboxservers in the sites with server rooms (Perth, Sydney, Darwin and Brisbane), but to have the smaller sites replicate through SCR back to the datacentres, and the 2 datacentres replicate to each other. So, Brisbane, Sydney, Darwin and Brisbanemailboxes would replicate to both Adelaide and Melbourne. Adelaide's mailboxes would replicate to Melbourne (but not the Brisbane, Sydney, Darwin and Brisbane mailboxes as they are already replicated), and Melbourne's mailboxes would replicate to Adelaide. Fine, no worries there - that's not the question. With 6 sites configured for SCR, we need to ensure that the drive letter used for the mailboxstorein Sydney is available in Melbourne and Adelaide - so that when if there is a failure and we need to mount the Sydney mailbox store in Melbourne, it will work. By trying to keep our mailbox stores small, we would normally create multiple mailbox stores in a storage group, and also try to keep a Storage Group on a dedicated RAID set, but with SCR you can only have one Mailbox Store per Storage Group that is enabled for SCR - so we very quickly run out of drive letters. Can we use NTFS Mount Points that would allow us to use a single drive letter but mount multiple RAID logical drives? So, we would have a single drive letter for each geographic location, and then mount different logical drives to folders within the same drive letter. My question is - will this work?

You can use mount points with SCR. Without SCR I often use path names like E:\MSXDATA\SG1DB and E:\MSXDATA\SG1LOG. With SCR I change this to E:\MSXDATA\<hostname>-SG1DB and E:\MSXDATA\<hostname>-SG1LOG <Hostname>-SG1DB or <Hostname>-SG1LOG could be mounted drives.