Users of Yahoo! Search Marketing could experience short-term fluctuations in their traffic during testing of ad delivery from adCenter.
Yahoo! said those with pay per click marketing campaigns could notice the decline over the next few days as trials of the Microsoft platform are accelerated to coincide with the start of account transitions on October 11th.
It added that once the transfer of ad serving to adCenter is complete, Yahoo! accountholders will see a decrease in clicks and impressions.
On the flipside, those with adCenter accounts already set up will see clicks and impressions rise – and as a result, they should be monitoring their budgets closely during the testing period.
Yahoo! said spending should be increased if a campaign comes with 20 per cent of its investment limit.
"Remember, the test volumes will fluctuate in the next couple of days, but don't jump to any conclusions about long-term traffic volumes based on these tests," the search engine commented.
The transfer of pay per click accounts to adCenter is expected to be complete by the final week of October.
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