Microsoft 365 Integration · London
Microsoft 365 Integration in London
Connecting a London organisation's own software to Microsoft 365 — mail, calendars, files, Teams. Almost all of it runs through Microsoft Graph, and the decision that matters most is permissions: application permissions grant access to every mailbox in the tenant, which is rarely what anyone intends.
Why this comes up
The problem
Your application needs to read calendars, send from company addresses or store documents in SharePoint, and the permission model is unfamiliar territory.
What you get
What we deliver
- Graph permissions scoped to the minimum, with delegated preferred over application
- App registration configured properly in Entra ID, with consent understood
- Calendar, mail or file access implemented against the correct Graph endpoints
- Change notifications subscribed to rather than polling, with renewal handled
- Throttling handled, since Graph will rate-limit and expects backoff
- Documentation of what the app can reach, which auditors will ask for
Want this scoped for your business in London?
Thirty minutes, no charge, no sales script. You leave with a written summary of what microsoft 365 integration would actually involve — whether or not you use us.
Working in London
London
London clients usually come to us because they want senior people actually on their project rather than a large agency's B team, and because Midlands rates buy considerably more delivery per pound.
Clients here are usually replacing an agency, and want senior people on the work at rates that are not Central London rates.
Sectors we work with in London
- Financial Services
- Professional Services
- Technology
- Media
- Hospitality
- Retail
What we work with
Technologies and platforms
- Microsoft Graph
- Entra ID
- TypeScript
- Azure
- OAuth 2.0
Who we work with
Industries we serve
- Professional services
- Financial services
- Education
- Healthcare
- Public sector
Why us
Why London businesses choose Asionis
- Projects typically launched within 4–8 weeks
- No long-term contracts required
- All team members UK-based
- Dedicated account manager and development team
- Transparent reporting with monthly performance metrics
- Scalable from startup to enterprise
How we work
- Step 1
Free consultation
A 30-minute call to understand the problem. You keep the written summary either way.
- Step 2
Proposal
Scope, timeline and a fixed price, in writing, before anything starts.
- Step 3
Build
Short cycles with regular check-ins, so you see progress rather than hear about it.
- Step 4
Launch and support
We handle the go-live and stay available afterwards.
Other services in London
Looking for the full picture? See our Microsoft 365 Integration services, everything we do in London or browse everything we do.
Microsoft 365 Integration in London — common questions
- What is the difference between delegated and application permissions?
- Delegated acts as the signed-in user and sees only what they can see. Application permissions act as the app itself and typically reach the whole tenant — every mailbox, every file. Use delegated wherever the work happens on a user's behalf.
- Can we restrict application permissions to certain mailboxes?
- Yes, and you generally should. Application access policies limit an app to a specified group rather than the whole organisation. Without one, an integration for a single team can read the chief executive's mail, which is difficult to defend in review.
- How should we detect changes?
- Graph change notifications rather than polling — faster and far less load. Subscriptions expire and must be renewed on schedule, and a renewal that fails silently is the common cause of an integration that quietly stops noticing anything.
- Why do requests start failing under load?
- Graph throttles, returning 429 with a retry-after header. It is expected behaviour rather than a fault, and integrations that ignore backoff make it worse by retrying immediately into the limit they just hit.
- Do you work with businesses across Greater London?
- Yes. We are based in Leicester, United Kingdom and work with clients throughout London, including London and the surrounding Greater London area. Most collaboration happens remotely, and we travel for kick-offs and key milestones.
- What kind of London businesses do you usually work with?
- Clients here are usually replacing an agency, and want senior people on the work at rates that are not Central London rates. Beyond that we work across Financial Services, Professional Services, Technology, Media, Hospitality and Retail.
- Do you cover the areas around London?
- Yes — we work throughout London, including Reading, Milton Keynes, Cambridge, Brighton. London is an urban area of roughly 9,000,000+, and we take on work across the wider Greater London region rather than the city boundary alone.
Talk to us about Microsoft 365 Integration in London
A 30-minute call with someone who would actually work on it. No sales script, no obligation.
- Projects typically launched within 4–8 weeks
- No long-term contracts required
- All team members UK-based
- Dedicated account manager and development team
- Transparent reporting with monthly performance metrics
- Scalable from startup to enterprise