New Office 365 URL categories to help you optimize the traffic which really matters

3rd April 2018 As part of the improvements Microsoft have recently announced to the way the required URLs and IPs for Office 365 are published, we have also changed how the URLs are categorized to help customers deliver best practice in terms of connecting to the required endpoints for the service. In the current system,…

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New URL & IP Provisioning Service for Office 365

03 April 2018 Today I’ve got some excellent news to share around improvements Microsoft have made in the connectivity space for the Office 365 service. This consists of two elements, a preview of a new method to provide the URL & IP requirements for the service which will help our customers manage and automate the…

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Office 365 Connectivity Guidance: Part 3

3. Unhindered access to the endpoints required. The next principle is to get your traffic to Microsoft as unhindered as possible, this means minimising the work done on the traffic or ensuring any work done doesn’t cause an impact to that traffic. When moving to the cloud it’s worth having a rethink about how you…

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Office 365 Connectivity Guidance: Part 4

4. Local DNS resolution Finally, local DNS resolution is a necessity to ensure Microsoft can connect your clients to resources based on their location. Many cloud services use this method, for example, we currently use Geo DNS for Exchange Online to connect your clients to the nearest front-end server for the service. I’ve covered this…

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Office 365 Connectivity Guidance: Part 2

2. Localized network egress as close to the user as possible To enable your user’s traffic to take full advantage of Microsoft’s global network, ideally, we’d want their traffic to egress locally and thus peer onto Microsoft’s network as quickly and as closely as possible. However, backhauling to a centralized internet egress is common for…

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Office 365 Connectivity Guidance

It’s been a while since my last blog post, mainly because my online effort has been going into our official guidance around Expressroute. http://aka.ms/tune/ and www.office.com However, one area I felt it would be worthwhile expending some effort on writing up whilst we work on more verbose guidance is, how to connect to your Office…

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HTTP Flood Mitigation causing slow Exchange Mailbox Migrations to Office 365

It's been a while since I've updated this blog as I've been busy rolling out content internally in Microsoft to help our customers connect to our cloud services. I do have some new tips around checking routing and ISP performance that I'll write up soon and publish. However, my colleagues have run into an issue…

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How to analyse Application level performance for Outlook and SharePoint online

If we've stepped through all the network level checks and all looks good from that perspective, then we need to move up the stack to the application itself and see if something above the network is causing performance issues. This can prove tricky with Office 365 as the information is almost always encrypted within an…

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Checking your TCP Packets are pulling their weight (TCP Max Segment Size or MSS)

This is a quick one to check to ensure your TCP packets are able to contain the maximum amount of data possible, low values in this area will severely affect network performance. Maximum Segment size or MSS is a TCP level value which is the largest segment which can be sent on the link minus…

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