The top three folders are non-Outlook examples for reference. That was a welcome surprise since many of the attachments are already compress formats like. The 10.5GB Message Attachments folder is now about 7GB. Message Sources was 4.5GB and is now about 3GB. Messages was 4.6GB and now uses less than 1GB. The three Outlook 2016 message folders get shrunk nicely by HFS+ compression. Here’s the results of some folder HFS+ compression. Our tests of HFS+ compression saved 9GB of disk space from 20GB of Outlook data – a whopping 47% improvement. HFS+ Compression with Outlook 2016 for Mac Now you’ve identified the Outlook for Mac data folders, you can compress them. That’s another reason why Outlook for Mac uses up so much disk space. OST), Outlook for Mac saves messages and attachments in many different files. Unlike Outlook for Windows (which has a single enormous data file. We used Disk Inventory X to look at the entire drive and see which folders took up the most space. Data is stored in Documents/Microsoft User Data then in ‘Identities’. Then drill down to /Data/ and three ‘Message’ folders: ~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile Outlook 2016 for Mac puts the data folders in the users Library folder We found a nifty and cheap tool to use HFS+ compression, but it’s disappeared. If you want to try HFS+ compression from the command line – check out here. The Apple supplied method is terminal command lines! That’s a right PITA and really strange for the usually user friendly Mac. Unfortunately, HFS+ compression isn’t easy to use. Note: macOS also has a feature called ‘Compress’ which is a different thing entirely. MacOS has a similar feature, HFS+ compression which has been available since the Snow Leopard release. The compression doesn’t save as much disk space as it once did because many file formats are now already compressed (e.g. It’s not used a lot on Windows computers now because hard drives have become a lot larger and cheaper. It’s easy to use and available on the Properties dialog for any file, folder or entire NTFS drive.

NTFS Compress works seamlessly in the background. Windows users have a ‘Compress contents’ options to shrink the disk space used by files.

Before you buy a new Mac or get a third-party drive upgrade, check out a somewhat hidden feature in the macOS – HFS+ compression. The result can be many gigabytes used up on a relatively small drive. In particular, the ability to only sync the most recent messages. Unfortunately, Outlook for Mac, even the latest Outlook 2016 doesn’t have some of the space saving options available to Office for Windows. Mac computers can have relatively small hard drives like 128GB or 265GB which Outlook 2016 for Mac can gobble up. Outlook for Mac is a disk space hog but the macOS has a way to recover some of that.

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