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Nothing alarming here for 50-80 users. If all of them maxed at 20 MB, you would still have an Exchange Server message store larger than 1 GB, not accounting for deleted item retention. It's not clear if you are seeing any performance issues yet.
It seems you do have plenty of disk space. You have implemented mailbox quotas. Event ID 1221 will tell you if you have any empty space in the store — this will be used first.
With the hardware configuration you described, it appears you are using a single, 300 GB, IDE or SATA drive. If that is the case, I highly recommend at least hardware RAID1 (mirroring) and separating the store (.EDB, .STM), the Exchange Server transaction logs, and the operating system to different volumes.
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Related information from SearchExchange.com:
Tip: Using multiple mailbox stores effectively
Tip: When Exchange mailbox size quotas break
Expert Advice: Determining the best mailbox quota size for your users
Expert Advice: Viewing mailbox size and setting mailbox notifications/quotas in Exchange
15 tips in 15 minutes: Managing recipients and distribution lists
Learning Guide: Exchange Server performance
Reference Center: Exchange Server mailbox management
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