I had an experience where a business group was using shared mailboxes to store 
emails with large attachments.  There was an issue where these mailboxes 
couldn’t be cached so every morning 30+ people would log in, saturate our 
internet link for hours.  We had all up around 900 users with a 100Mbit 
internet link.

In the end those mailboxes had be bought back on site using the hybrid box.

From: AusNOG [mailto:ausnog-boun...@lists.ausnog.net] On Behalf Of Ashley 
Knowles
Sent: Tuesday, 19 June 2018 12:16 PM
To: Brenden Cruikshank <bren...@cruikshank.com.au>; James Deck 
<jd...@1300webpro.com.au>; AusNOG@lists.ausnog.net
Subject: Re: [AusNOG] [AUSNOG] o365 experience

The migration effort itself can be staged so you can sync 95% of the mailboxes 
within a batch prior to cutover, then go in and complete the migration batch at 
a later date, which copies the remaining 5% + delta of changes since the 
previous sync. We found the biggest problem to be large mailboxes (>10GB) where 
the 5%/delta exceeded 500MB, meaning the cutover run all night or even into the 
next day.

Microsoft’s FastTrak service isn’t too bad, it’s really aimed at getting a 
pilot operational before they hand you off to partner to do the rest of the 
work, or set you up to do it yourself.

Another gotcha; Microsoft also throttles the inbound migration, so you can only 
do so much per hour. You can tweak this by changing the number of concurrent 
migrations, and in some cases Microsoft will increase the limit for you 
(example: if you have a Premier support contract)


From: AusNOG 
<ausnog-boun...@lists.ausnog.net<mailto:ausnog-boun...@lists.ausnog.net>> on 
behalf of Brenden Cruikshank 
<bren...@cruikshank.com.au<mailto:bren...@cruikshank.com.au>>
Date: Tuesday, 19 June 2018 at 12:38 pm
To: James Deck <jd...@1300webpro.com.au<mailto:jd...@1300webpro.com.au>>, 
"AusNOG@lists.ausnog.net<mailto:AusNOG@lists.ausnog.net>" 
<ausnog@lists.ausnog.net<mailto:ausnog@lists.ausnog.net>>
Subject: Re: [AusNOG] [AUSNOG] o365 experience

Paul,

Tell us about your existing environment (Exchange 2010/2013/2016)? Whats your 
uplink speed? The number of mailboxes? Total mailbox size?

I had Exchange 2010, 50mb uplink and 3Tb of mail to migrate, it was stressful 
as this link was also our internet WAN link too.

In the end, I migrated 200 users with Microsoft fast-track support and we had a 
successful migration project and decommissioned the 2010 environment and our 
netbox blue spam appliance.

We are only using Exchange Online and OneDrive for Business and its great; I no 
longer need to manage exchange and deal with the frequent outages we had on the 
2010 setup I inherited.

It requires lots of planning as I don't think users were ever deleted before I 
started.

We had an Optus "managed" network we found Optus aggressively traffic shaping 
Office 365 which caused Outlook to lock up continuously and it was a very poor 
end-user experience until we put in faster links (with another ISP).

We have a hybrid configuration so we still use an Exchange 2016 VM to manage 
users, You should be matched your UPN to your SMTP address, we had to rename 
200 users to firstname.lastname which wasn't fun but that's a part of planning 
your migration.

The only thing missing with Office 365 is the basic spam and virus 
protection/security is pretty poor. So we're looking at deploying a cloud email 
security service next FY.

Cheers
Brenden


On 19 June 2018 at 11:10, James Deck 
<jd...@1300webpro.com.au<mailto:jd...@1300webpro.com.au>> wrote:
We’ve had a lot of success, once the nuances were learned. Things that were 
tricky the first time around, but are okay once you get the hang of it:

- AD sync
- managing the users after AD sync is in place (having to edit the actual ADSI 
attributes is a bit strange)
- importing PST files into Online Archive (requires uploading to Azure blob 
storage via PowerShell)
- having different email addresses and logins (eg. 
jd...@1300webpro.com.au<mailto:jd...@1300webpro.com.au> as my login and deck as 
my AD login --> d...@1300webpro.com.au<mailto:d...@1300webpro.com.au> as my UPN)

Certainly, when you have weirdness and have to contact China it is an absolute 
nightmare. We have one at the moment where a user’s outgoing mail (external 
senders only) get stuck in the Outbox in Outlook for a period of time. The 
support person’s “resolution” was to use OWA.

On the whole, I would rate the experience of post-migration users as superior 
to on-prem (aside from when you have a “call China” problem). I am very much an 
on-prem person, so this assessment is saying something :)



​Kind Regards, ​
​

James Deck


Managing Director


1300 Web Pro




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From: AusNOG 
<ausnog-boun...@lists.ausnog.net<mailto:ausnog-boun...@lists.ausnog.net>> on 
behalf of Paul Wilkins 
<paulwilkins...@gmail.com<mailto:paulwilkins...@gmail.com>>
Date: Tuesday, 19 June 2018 at 11:04 am
To: "AusNOG@lists.ausnog.net<mailto:AusNOG@lists.ausnog.net>" 
<ausnog@lists.ausnog.net<mailto:ausnog@lists.ausnog.net>>
Subject: [AusNOG] [AUSNOG] o365 experience

I'd be interested to hear general opinions and lessons learned from o365 
migrations. So far as I've seen, the architecture (network and services) is 
complex, and user experience can never equal local Exchange.

So much so it leaves me wondering if the effort of migration can be justified? 
At the end of the day, you need a performant service, not finger pointing 
between networks and services, and blaming performance on insufficient 
network/proxy scale out.

Kind Regards

Paul Wilkins

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