![]() There is also a limitation to the number of simultaneous connections you can have to a single public folder mailbox, which is 2,000. If you are familiar with the limitations of public folders in Exchange Online, you will know that there is a hard limit of 50GB for each public folder mailbox, and a limit of 1,000 public folder mailboxes in a single tenant. There may be larger ones out there, but Microsoft does not appear to be aware of any. They told me that Microsoft had actually stated that they had the largest public folder base they had ever seen. When talking to this customer’s IT staff, they mentioned that they had previously consulted with Microsoft specifically about the public folders issue. I’ll give you a minute to let that set in… For sites that weren’t large enough to justify a dedicated public folder server, they had their public folder content spread out in random locations. For example, public folder content for UK users was only in the UK, while public folder content for US users was only in the US. If that wasn’t overwhelming enough, the public folder replicas were split up and spread out all over the world. They also had over 2.2 million public folders, topping off at just over 90TB. They had roughly 140 servers spread across about 35 sites. I recently worked on an Office 365 migration project for a customer that had Exchange 2007 on-premises. But that isn’t what this article is about. Public folders are still an ancient way to store anything and everything under the sun in Exchange, creating headaches for Exchange admins for years to come. The move to modern public folders with Exchange 2013 made some drastic improvements, but to call them “modern” seems misleading (and even humorous) to me. ![]() Understandably, it is difficult to do away with support for a feature that is so heavily depended on with legacy systems. ![]() Microsoft has made promises to do away with them time and time again, yet they are still around and as painful as they have always been. Those of you familiar with public folders know how much of a pain they can be. ![]()
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