Best practice max mailbox send /size Exchange 2007

I was wondering what the best practice would be for the max size would be for the mailbox.

I have the following "groups" for send / recieve.
Group - A
Warning: 450 MB
Stop sending: 500MB
Stop recieving: 550MB

Group - B
Warning: 950MB
Stop Sending: 1000MB
Stop recieving: 1050MB

Group - C
Warning: 1950MB
Stop Sending: 2000MB
Stop Recieving: 2050MB

Group - D
Warning: 2550MB
Stop Sending: 2600MB
Stop Recieving:2650MB

Group - E
Warning: 3650MB
Stop Sending: 3700MB
Stop Recieving: 3750MB

Group A&B are aproximatly 75% of all the people who have an exchange mail account.
Now have I found out the folowing options:
Have a Seperated Mailbox store for each group.
Main size is Group A, all other account have account bound limits but all are on the same store.

I was wondering, if it would be possible to also have limits for each group, so i would easy be able to change quota for those persons, or that one of the soluitions above would be more stable/better to maintain.
Currently we only have 1,8 GB left on the disk (C disk) and are not able to move it to another disk.
Who is Participating?
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
It is better to have the limits on different mailbox databases and put the users in the databases accordingly. That is the easiest solution.

I don't understand what you mean by applying limits to groups.
I think you're looking too deeply into this.  Just make one group that is for standard users that have normal limits (20MB), and have another group that will be unlimited.

I don't restrict attachment sizes for my users.  That's just me....
In one sense there is no real "best practices" for mail box size limitations.

The mailbox sizes should be large enough to allow employees to do their jobs.  But not so large that you could start expriencinng problems with the Exchange server based on the hardware it is running on.

The mailboxes should also not be so small that uses start moving things from Exchange to personal PST files if your company has a document retention policy.  Unless the policy states they can do this and also dedicates what they can keep there and for how long.

You are on the right track. If would be easier for you to maintain DBs and Limits if you group these users in seperate DBs. Group1 - DB1, Group2 - DB2 and so on. Policies would take care of them.
I am also assuming that these groups are similar kind of oprofiled users, in that case you can also have proper Backup Strategy also for them in future. Some daily some weekyl and so on.....
Let me know
Nitin Gupta (gupnit)
Mindless999Author Commented:
Thanks for Confirming my toughts on this.
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