What Was Happening
A customer got in touch about a calendar that would not behave. He had an iCloud email address but, like a lot of people, preferred to run his email and calendar through Outlook rather than Apple’s own apps. The problem was that when he added a new appointment or accepted an invite on his iPhone or iPad, it would not show up in Outlook on his Windows laptop. His phone and tablet agreed with each other; the laptop was the odd one out.
From his point of view the calendar was simply broken, and he was understandably frustrated — a calendar you cannot trust to be up to date across your devices is worse than no calendar at all. He brought the laptop into our Putney shop so we could look at it properly rather than guess over the phone.
Our Diagnosis
We started with the cheapest, most revealing check rather than diving into account settings: which version of Outlook was actually installed. This matters more than most people realise. Microsoft now ships two quite different programs under the Outlook name — the long-standing classic Outlook desktop client, and a newer, free “Outlook (new)” app that has been steadily replacing it on Windows.
The laptop was running the free New Outlook. He had assumed it was the full version that came with his paid Microsoft 365 subscription, which is an easy assumption to make — the icon and the name look the same. The catch is that the free New Outlook does not yet support the same depth of account and third-party integration as the classic client. For someone running a mixed setup — an iCloud address, Apple devices, and Outlook on Windows — that gap is exactly what stops calendar entries flowing reliably from one place to another.
We confirmed he had an active, paid Microsoft 365 subscription, which meant he was entitled to the classic Outlook client and did not need to buy anything extra to fix the problem.
How We Fixed It
With the cause identified, the fix was to get him off the free app and onto the classic Outlook client his subscription already covered. We installed and set up the classic Outlook desktop client on the laptop and configured his account within it correctly, so the calendar was being managed by the program that actually supports the integration he needed, rather than the cut-down free app.
Because he had brought the device into the shop, we were able to do this in one visit rather than talking him through installs and account settings remotely — which, with two near-identically named programs in play, is exactly the kind of job that is far easier to get right hands-on.
The Result
He left the shop with the classic Outlook client installed and his account set up in it — the supported configuration that the free New Outlook could not provide. The point of the visit was less about a single setting and more about getting him onto the right program in the first place: once the calendar is being run by the full client rather than the limited free app, it has the account integration it needs to stay consistent across his devices.
Why This Happens
This is a fast-growing source of confusion, and we expect to see a lot more of it. Microsoft has been rolling out the free “Outlook (new)” app and nudging Windows users towards it, often in place of the classic client they were used to. The two share a name and an icon but are not the same program, and the new one has been catching up on features rather than matching the classic client from day one.
People hit trouble when they assume the app in front of them is the full, paid version — and then find that something they relied on, like tight calendar integration with another ecosystem, no longer works. Mixed setups make it worse: an Apple phone and tablet, an iCloud or third-party email address, and Outlook on a Windows machine all have to cooperate, and the free app is the weak link in that chain. It looks like a broken calendar, but it is really a question of which client is doing the work.
New Outlook vs Classic Outlook: What to Check
- Find out which one you have. In the app, the free version is usually labelled “Outlook (new)” and often has a toggle in the top corner; the classic client does not.
- If you pay for Microsoft 365, you are entitled to the classic Outlook desktop client — you do not have to make do with the free app if it is missing features you need.
- If a calendar or account works on some devices but not others, suspect the app and its configuration before assuming the calendar itself is corrupt.
- Mixed Apple and Microsoft setups are the most likely to expose these gaps, so it is worth getting the client and accounts set up properly from the start.
Local Help in Putney SW15
We sort out email and calendar setups for people and small businesses in Putney SW15 and across South West London, including the increasingly common muddle between the free New Outlook and the classic Microsoft 365 client. If your calendar or email behaves differently on different devices, bring the device into the shop or get in touch — it is usually a configuration or wrong-app problem we can put right, not a fault you need to live with. Call us, use the contact form, or drop in.