Office 365 Connectivity Guidance

Updated 23 May 2019 Whilst our official guidance around Office 365 connectivity can be found at and also here it’s worth discussing in detail what best practice looks like in this space. An area I spend a great deal of time working on, is how to best connect to an Office 365 implementation from…


Ensuring your Proxy server can scale to handle Office 365 traffic

Proxy servers are often in place at customer sites, happily ticking away handling Internet traffic for years before Office 365 came along. As Office 365 generally travels over port 443 (for Outlook and SharePoint at least) then what’s to think about? Your proxy can handle this like any other SSL traffic right? Well, yes technically…


Top 10 Tips for Optimising & Troubleshooting your Office 365 Network Connectivity

Having performed numerous Office 365 Network assessments and reactive visits to resolve issues for customers, its apparent that the vast majority of issues are seen time and time again. So from this experience, here are my top 10 tips for you to optimise your O365 network performance and prevent issues occurring in future. Some of…


Preventing proxy authentication from delaying your O365 connection

A quick and easy check you can do to ensure your O365 connections complete quickly is to check proxy authentication is completing quickly, or better still not being done at all. If you're not using a proxy and are going direct, then you can move along…nothing to see here! It's surprisingly common and I've run…


Ensuring your Office 365 network connection isn’t throttled by your Proxy

One of the things I'm regularly running into when looking at performance issue with Office 365 customers is a network restricted by TCP Window scaling on the network egress point such as the Proxy used to connect to Office 365. This affects all connections through the device, be it to Azure, or google Bing….


Network Perimeters & TCP Idle session settings for Outlook on Office 365

*Update . This issue no longer occurs now we’ve switched to MAPI/HTTPS for every client/server connection aside from Outlook 2007. RPC/HTTPS which is what was causing this problem is being put out to pasture in October 2017.,-2017 If you’re using a version of Office greater than 2007 then the advice is as follows: A minimum…