Using POP to download mail from a mailbox has the following problems:

  1. Only emails from the INBOX get downloaded using POP. Any mails sent or in other folders will not get downloaded.
  2. For large downloads, the company Internet will get used up leading to slow Internet access for all other users of the company.
  3. A large download may lead to corruption of data in the email client.
  4. The email client will become unresponsive for the user and regular mail flow will be hampered
  5. Depending on the Internet bandwidth and the size of the mailbox, the download may take many days.
  6. The ISP may block the POP port if the download crosses the threshold set.
  7. POP access to the account on the SkyConnect server will get blocked if it crosses the threshold.
  8. May cross the size limits of a PST in the desktop client.